One thing about Sanji is this: he's going to take care of people. In cooking, yes, though that's only the half of it. Sure, he spends hours a day every single day in the galley cooking, preparing meals, writing recipes, planning dinners, catering to everyone's needs. He'd say it's simply his job, and it is to a degree. But the crew could get by with three decent meals a day. There's no real "need" for the countless snacks and drinks he prepares and brings out, day after day, always unique and thoughtful. It's not part of his job to do laundry for those who can't (won't) do it themselves, or to mend torn clothing, or bring Chopper to bed when he inevitably falls asleep at his desk or the table. He goes above and beyond like it's his sole duty to take care of everyone.

Unfortunately, he is bad at being taken care of.

You're not the only one who tries, but if anything, it's hardest for you. Sanji all but refuses to let his precious partner lift a finger unless absolutely necessary, and it drives you insane. So, you decide one evening that you will pamper and spoil him if it's the last thing you do.